I think the rats have contingency plans in case of rain.
Heck, they could use one of the vacant car dealership showrooms that still languish in Charlotte 3 years after the auto bailout.
There is no ‘contingency’ plan for 73K from what I’ve heard. They said the event will go on ‘rain or shine’ unless there is severe weather (lightning). The other thing I’ve heard is that it will be just like the football games ... if it rains, tough for the crowd. If there is lightning, the crowd will have to move to the concession areas where there is some cover. In other words, if it rains, it will be a MESS!! Obama/Biden are not scheduled to go to the covered convention hall which is why security is much lighter there ... all the SS efforts are at the stadium. Come on Leslie!! :-)